Car audio analysis tools.

Now you can test your automobile sound system audio using a professionally-designed test and measurement app.

The free app includes ad-supported, limited-feature versions of our professional-quality SPL meter, RTA, FFT Analyzer, and Polarity Tester. Upgrade with the AudioControl SA4100i test and measurement microphone and everything is free! All of the modules are automatically unlocked as soon as you plug in the microphone.

You can also buy any of the modules as ad-free and full featured, even if you don't use our microphone.

Using just the built in iOS device microphone, you can test things like frequemcy response, speaker driver polarity, SPL level, and more.

Adjust your sound system equalizer by sending pink noise to your system, measuring the frequency response with the RTA (Real Time Analyzer) or the FFT Analyzer. Try to get the flattest response, with a slight (or huge!) low end boost.

What’s New

Version 2.4

-Updated for iOS 13
-Fixed issue with setup menu
-Bug fixes and stability improvements

Ratings and Reviews

3.1 out of 5
7 Ratings

7 Ratings

Arky in Boca Raton ,

Not Presently Compatible with IOS 12 (betas)

Crashes immediately. Downgraded to IOS11.4.1 worked fine. Don’t waste your time on the betas; if you are using this software.

Grumble Stiltskin ,

It's now a pain to use!

*The latest update appears the have corrected the issues. My review score has been updated to reflect that.*
After updating the app I periodically can not use the tone generator or other functions without connecting my SA-4140i SPL mic. The app prompts me to buy the additional functionality for various sums of money. I ALREADY BOUGHT THE $270 HARDWARE and do not appreciate being prompted to spend more money for functionally I have already paid for.


Currently broken - just crashes without opening (iOS 12.4)

Will update if/when fixed


69 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German, Japanese, Polish, Simplified Chinese, Swedish

Age Rating
Rated 4+
© Andrew Smith
In-App Purchases
  1. RTA Full Features $4.99
  2. FFT Full Features $8.99
  3. Reference Curves $3.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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